Re: [MirageOS-devel] network performance question

[Takayuki Imada <takayuki.imada@xxxxxxxxx>]

Justin,

Thanks for providing the information.
I would like to add the following information:

1. total CPU utilization (host + VM)
>   4401 qemu      20   0 6038648 2.309g  22968 S 100.0  7.4  43:24.27 
qemu-system-x86
>   4422 root      20   0       0      0      0 R  83.2  0.0   0:22.90 
vhost-4401
This indicates about 1.8 CPU cores were assigned for the Linux VM iperf 
receiver.
>   24788 root      20   0  528708  16148  16064 R 100.0  0.0   0:04.35 ukvm-bin
On the other hand, the MirageOS iperf server was running with just 1 CPU core 
in total.

2. Memory size assigned(used)
The above results indicate that the Linux VM was using 2.3G physical memory 
space,
but the MirageOS VM was running with 512MB physical memory size(this size is 
fixed in Solo5/ukvm).

I guess that the above two points and networking implementation difference 
between Linux and MirageOS affected the performance difference you observed.

Kind regards,

--
Takayuki Imada


On 10/24/17 9:41 PM, Justin Cinkelj wrote:
>  From my first mail:
> > ubuntu VM:
> > iperf -c 192.168.122.20 -t10
> > ------------------------------------------------------------
> > Client connecting to 192.168.122.20, TCP port 5001
> > TCP window size: 85.0 KByte (default)
> > ------------------------------------------------------------
> > [  3] local 192.168.122.1 port 52674 connected with 192.168.122.20 port 5001
> > [ ID] Interval       Transfer     Bandwidth
> > [  3]  0.0-10.0 sec  52.9 GBytes  45.4 Gbits/sec
> > top:
> >    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
> >   4401 qemu      20   0 6038648 2.309g  22968 S 100.0  7.4  43:24.27 
> > qemu-system-x86
> >   4422 root      20   0       0      0      0 R  83.2  0.0   0:22.90 vhost-4401
> > 24759 justin_+  20   0  165812   1892   1728 S  51.5  0.0   0:03.91 iperf
> I left the -P (number of parallel client threads to run) at default value - 
> which is 1.
> KVM VM used 100% (1 whole cpu core), and the corresponding vhost process used 
> 80% of CPU core.
> So I did run test in single-thread mode for both Linux VM and MirageOS.
> On XEN, xentop also showed 100% cpu usage for the MirageOS VM.
>
> Thank you for answering
> Justin
>
>
> On 10/24/2017 02:30 PM, Takayuki Imada wrote:
> > Hi,
> >
> > This is similar to what I observed previously, not so surprising.
> > But, I want you to check how many CPU cores are totally utilized on both the 
> > Linux VM and MirageOS configurations.
> > I guess only 1 CPU core are utilized on the MirageOS configuration whereas 
> > multiple CPU cores are utilized on the Linux configuration.
> >
> > Kind regards,
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